How to determine the destination address of a letter if the 'to' field of the letter header contains only the name of the recipient?

Question

PHP

In general, in the headers of letters coming from known mail servers, the 'to' field contains the destination address (coming from gmail, mail.ru, ya.ru), but it also comes across that there is just the name of the recipient: for example, ["to" ]=> string(31) "gfgdfgdg ". How to get the destination address then?

Answer 1

Fields CC and BCC.